Aqueous extracts of mango leaf as green corrosion inhibitors for SUS304 in HCl and H2SO4 solutions / Nurain Atiqah Ahmad Zapwan

Green corrosion inhibitors in acid mediums have advantages of wide source, low cost and environmental protection. This work aim to use an extract of Mangifera indica leaf as corrosion inhibitor for two types of acids. Mangifera indica leaf extract (MLE) was prepared through solvent extraction in 60:40 ethanol: water solvent system. The presence of active components with aromatic and oxygen-containing functional groups in the Mangifera indica leaf extract was demonstrated by FT-IR and UV-Vis analysis. The functional groups presence in the extract were (O-H, C=C, C=O, and C-H). Corrosion tests, weight loss measurements, and surface studies were used to investigate the inhibition of SUS304 corrosion in HCl and H2SO4 solutions using Mangifera indica leaf extract. The results showed that as inhibitor concentration increased, inhibition efficiency increased, reaching a maximum of 91% after 3 hours with 900 ppm inhibitor. The corrosion inhibitor efficiency was dependent on Mangifera indica leaf extract concentration and types of acid medium. This finding will give good implication to metal industries in utilizing green, environmentally friendly, less toxic and biodegradable corrosion inhibitors.